How do I access and plot thetadot vs. time from function I have created?

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Shlok Pravinbhai Kansara 2022-10-8

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编辑： Shlok Pravinbhai Kansara 2022-10-8

function thetadot= oscltr(t,theta)
A= [0 0 0.5 0 0 0; 0.5 0 0 0 0 0.5; 0.5 0.5 0 0 0 0; 0 0.5 0 0 0 0; 0 0 0.5 0 0 0; 0 0 0 0.5 0.5 0]; % edge weight matrix
D= [0.5 0 0 0 0 0; 0 1 0 0 0 0; 0 0 1 0 0 0; 0 0 0 0.5 0 0; 0 0 0 0 0.5 0; 0 0 0 0 0 1]; %Diagonal in-degree matrix
L= D-A; %Laplacian matrix
N=6;
K=50;
wi=[1; 1.1 ;0.9; 0.85; 2; 2.1];
thetadot=wi-(K/N)*L*theta;
end

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Answer 1

Walter Roberson 2022-10-8

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Please see my response at https://www.mathworks.com/matlabcentral/answers/1818985-how-to-work-variables-outside-function#answer_1068360 discussing why it is unlikely that you want to access the internal variables computed by an ode function: such a record would have far too many entries and would also not have entries for most of the time steps.

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Shlok Pravinbhai Kansara 2022-10-8

编辑：Shlok Pravinbhai Kansara 2022-10-8

Thanks @Walter Roberson, I believe, I resolved it using your commnet of gradient().

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Answer 2

Ghazwan 2022-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/1820045-how-do-i-access-and-plot-thetadot-vs-time-from-function-i-have-created#answer_1069365

编辑：Walter Roberson 2022-10-8

在 MATLAB Online 中打开

There are several ways, one of whith would be

Dtheta=diff(theta)   %theta = values
Dtime=diff(time)    %time = time values.
ThetaDot = Dtheta./Dtime.
plot(Dtheta,time) % you have to be careful in case there is 0/0 somewhere.